diff --git a/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManager.php b/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManager.php
index cc198e39e4..56dd3b7411 100644
--- a/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManager.php
+++ b/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManager.php
@@ -67,18 +67,4 @@ public function processDefinition(&$definition, $plugin_id) {
     }
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getSourceModule($definition) {
-    return $definition['source_module'];
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getDestinationModule($definition) {
-    return $definition['destination_module'];
-  }
-
 }
diff --git a/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManagerInterface.php b/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManagerInterface.php
index 82a8d6bf3c..7219c2b301 100644
--- a/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManagerInterface.php
+++ b/core/modules/migrate_drupal/src/Plugin/MigrateFieldPluginManagerInterface.php
@@ -25,26 +25,4 @@
    */
   public function getPluginIdFromFieldType($field_type, array $configuration = [], MigrationInterface $migration = NULL);
 
-  /**
-   * Gets the source module providing the source data.
-   *
-   * @param array $definition
-   *   The field plugin definition.
-   *
-   * @return string|null
-   *   The source module or NULL if not found.
-   */
-  public function getSourceModule($definition);
-
-  /**
-   * Gets the destination module handling the destination data.
-   *
-   * @param array $definition
-   *   The field plugin definition.
-   *
-   * @return string|null
-   *   The destination module or NULL if not found.
-   */
-  public function getDestinationModule($definition);
-
 }
diff --git a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
index d41c751e8e..d4e7b6fad9 100644
--- a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -508,8 +508,8 @@ public function buildConfirmForm(array $form, FormStateInterface $form_state) {
     // Get the source_module and destination_module from the field plugins.
     $definitions = $this->fieldPluginManager->getDefinitions();
     foreach ($definitions as $definition) {
-      $source_module = $this->fieldPluginManager->getSourceModule($definition);
-      $destination_module = $this->fieldPluginManager->getDestinationModule($definition);
+      $source_module = $definition['source_module'];
+      $destination_module = $definition['destination_module'];
       $table_data[$source_module][$destination_module][$definition['id']] = $definition['id'];
     }
 
@@ -522,13 +522,12 @@ public function buildConfirmForm(array $form, FormStateInterface $form_state) {
 
     // Fetch the system data at the first opportunity.
     $system_data = $form_state->get('system_data');
-    $unmigrated_source_modules = array_diff_key($system_data['module'], $table_data);
-
-    // Remove core profiles from the list.
+    // Remove core profiles from the system data.
     foreach (['standard', 'minimal'] as $profile) {
-      unset($unmigrated_source_modules[$profile]);
+      unset($system_data[$profile]);
     }
 
+    $unmigrated_source_modules = array_diff_key($system_data['module'], $table_data);
     // Missing migrations.
     $form['missing_module_list_title'] = [
       '#type' => 'item',